Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd81e0aae480d618…

MALICIOUS

PDF

75.1 KB Created: 2021-09-21 19:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 720b21ce8bb19a31795b6481e01c4379 SHA-1: 0c7cc72e9d6a8459a97b972f24ddb789958b076b SHA-256: fd81e0aae480d61868e7e5e69b13868702eb6a0ae4307ce3b9098b5047ebae30
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9788

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://garglob.ru/uplcv?utm_term=music+id+roblox+2020 PDF link annotation
    • http://goodfortune.hk/UpLoadFile/file///zonukojikigozugaxobeso.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/zipetulavusafixugere.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/461497582.pdfIn PDF document text
    • http://klenderbio.com/upload/files/xekezalojopipuzav.pdfIn PDF document text
    • https://shevian.com/images/file/mubegevepewej.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/7764913920.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/jabov.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/fumodokar.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/zatulo.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/87895064180.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/29435459060.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/8f0b215a2f301fc987b39899f536942c/tudozi.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/tulajugulepotovonem.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/figejozaves.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/12057379253.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/kuxan.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/bajoru.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/semebotokolikumabe.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/eb9226541f2b5a16e61b769282bfe027/vixipapomaxuxosojizesab.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/kudozamikevusiduvaza.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/5221700321.pdfIn PDF document text
    • http://hkacca.com/userfiles/dibedumupidet.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/25245042924.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/93263668834.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136497154713---luxonewitinogater.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/8080246549.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/42161067601.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD497 1948 bytes
SHA-256: b033f7fcbcd390b2cb396fbb5f03ef01f7ca9afc151f9d9df21604321f961cfa
font_02_sfnt_off0000dd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD96 16012 bytes
SHA-256: e76a805da57f13d9859e4372bb2e613cba81c81087e017677b82fe9d2d014a4c
font_03_sfnt_off00010654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10654 10444 bytes
SHA-256: f5ed9bdfab97b00559c754ca11eee5399d5f6fc2b51c5479c1c600496bffb6f1

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